Are invisible fences safe and humane for dogs?

This is the most contested question in the category. Higher-trust threads on r/Dogtraining and r/OpenDogTraining are openly skeptical, citing welfare and reliability concerns, while r/BelgianMalinois and r/homestead users report years of successful, low-issue use. Most reviewers agree that a proper training protocol with flags and supervised sessions, plus starting at the lowest correction level, is non-negotiable.